Can you really learn a language with duolingo?

Related questions

1. Does duolingo teach Czech?
2. Is Czech and Polish the same language?
3. Can you actually learn a language while you sleep?
4. How far is Berlin from Prague by train?
5. How much should I tip in Prague?
6. Can Polish speakers understand Czech?
7. Can I drink the tap water in Prague?
8. How long does it take to learn a language with duolingo?
9. Is the Czech language similar to German?
10. Do Czech speak English?

Tags

1. #fluency
2. #though
3. #addition
4. #stand
5. #remember
6. #forget
7. #truly
8. #learner
9. #course
10. #alone
11. #excellent
12. #achieve
13. #duolingo
14. #works
15. #toolbox
16. #learning
17. #speak
18. #homework
19. #language